int LEDS[] = {3,5,7};
int BUTTONS[] = {2,4,6};

void setup(){
  for(int pin = 0;pin<3;pin++){
    pinMode(LEDS[pin],OUTPUT);
    pinMode(BUTTONS[pin],INPUT);
  }
}
void lopp(){
  for(int led = 0;led<3;led++){
     digitalWrite(LEDS[led],HIGH);
  }
 
}